Question

An electron of energy 150 eV has wavelength of 10-10m. The wavelength of a 0.60 keV electron is?

a) 0.50 Å

b) 0.75 Å

c) 1.2 Å

d) 1.5 Å​

Answer 1

Answer:

a) 0.50 Å

Explanation:

ε=

2E

e

m

h

P

ε

1

∝

E

1

1

.....(1)

ε

2

∝

E

2

1

....(2)

1 and 2

ε

1

ε

2

=

E

1

E

2

ε

2

=ε

1

E

1

E

2

10

−10

150

60

=−2

⇒(

2

1

)×10

−10

m

⇒0.5×10

−10

Answer 2

Answer:

Option a

HOPE IT HELPS!!!